As the summer season approaches I have found a great putting drill that will help you to ensure that you are rolling your ball down the intended line with your putter.
You can purchase this tool (meter stick) at any hardware store. Once you have your own, place the meter stick on the ground and put a ball on it. The goal of the drill is to putt your ball and keep the ball rolling on the meter stick without it falling off of the right or left edge. This will help you to develop a feel for putting the ball down your intended line.